You shouldn't have to use heat. When I did my top end rebuild (1992 XT600E) the four bolts you speak of were not that bad, at least that I can remember. Just undo one a 1/4 - 1/2 turn then go to the next, in a X pattern, until they all come loose. The acorn nuts are a bit of a pain...but you can break them loose with an open ended wrench. To torque them to spec, when putting everything back together, I had to buy some crow-foot wrenches and even with those it was a bit tricky.
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